Blood Pie wrote:swo17 wrote:Blood Pie wrote:No doubt 2K and/or 4K technology will eventually become a mass produced reality but a high quality 1080p BD is close enough to the level of information of a 35mm print (I believe its around 70-80% depending on production and film stock choices and some sites and sources will roughly convert 35mm to a line rating that I'm too lazy to look up).
Someone correct me if I'm wrong here, but Blu-ray has 1080 horizontal lines of resolution. 35mm film can be reasonably replicated at around 4K resolution. That's four times more lines of resolution. When you square that, it puts a 4K scan as having about 14 times more information than Blu-ray. Or in other words, a Blu-ray frame retains only like 7% of the info from a 35 mm frame. Granted, that's a huge improvement over the roughly 1% of DVD, but it still leaves plenty of room for improvement. And that's precisely the kind of improvement you're going to be wanting in 20 years when everyone who's anyone has 300" Ultra-HD flat panels in their living rooms.
Well, I could be wrong, but 35mm was roughly converted as few hundred lines more than 1080p according to most of the info I could find which was minimal.
I'll look for the information nd post it when I find it.
You're both wrong. For starters, 1080p is, as you say, horizontal lines of resolution, but 4K is not. 4K is horizontal pixels (vertical lines) of resolution. So 1080p (1920x1080, or 2.1MP) is pretty close to 2K (2048x1152, depending on whose 2K you're using. 2.35MP), which is quite a bit less than 4K, but not 14x. 4K is typically something like 4096x2048 (2:1) or 4096x2304 (Redcode RAW), which puts it in the ballpark of 8-9.5 MP. Roughly 4x 1080p, which is roughly 4x 480p (though it gets more complex with anamorphic DVDs).
That said, 2K is what almost all movie theaters project when they are projecting digitally. 4K projectors are still pretty uncommon (I don't know of any in NY theaters). Up until a few years ago, most digital film restorations were being at 2K (I think
Alien was 2K), and the results in the theater were good enough for most people (not so great if you sat in the front row).
That said, film's detail doesn't resolve as pixels, so it's sort of a sliding scale. If you take a 2K image and put it on film, film can mostly handle the level of detail present. If you take a 4K image and put it on film, you're going to start to lose a lot of the detail in the video, even if it captures more detail than the 2K image. If you move to 6K, you'll still gain detail on the film stock, but it won't be nearly as dramatic a difference as going from 4K video to 6K video.
There's a link around somewhere to a 6K still from the 6K restoration of
Yojimbo. Looking at that you can see that there's a ton of detail that would get lost in a 1080p, 2K, or 3K transfer. Whether that detail is important is another question.
Personally, I would prefer a format that not only renders the fact of grain (as DVD can do with a grain film), but renders the texture of the grain as well. 1080p isn't really enough for that.
If I recall correctly, standard 35mm film stock is about half as much film area (a little less for 1.85 films, a little more for Super 35) as still 35mm photography. What that means is that you can look for comparisons between digital and analog still photography, and expect that most motion picture film stock will register detail at about half the digital-resolution-equivalent as an equivalent still photography film stock. VistaVision (
In the Realm of the Senses) and 65mm (
The Leopard) are, I believe, comparable to 35mm still photography (65mm is a little bit bigger).
The "resolving power" of film stocks vary greatly depending on the ISO, the contrast of the image, B&W vs color, and the stock itself. It's really just a measurement of the point at which lines become indistinct when you have so many in relation to the area physically taken up on the film. This isn't exactly comparable to digital, where a line is a line. But I believe a good resolving power is ~120 lines/mm whereas a very poor resolving power is more like ~33 lines/mm. Keep in mind that a "line" here is really a line pair. If we pretend that it's an apples-to-apples comparison (it's not), that would translate to 5300x3840 (>5K) versus 1452x1056 (closer to BD than DVD) for an anamorphic or academy film.